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Multiple Vulnerabilities in Tenda Wireless Router 

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Systems Affected

Tenda 300Mbps Wireless Router F3 and the Tenda N300 Easy Setup Router

F3 v3.0 Firmware V12.01.01.41 

F3 v3.0 Firmware V12.01.01.42

F3 v3.0 Firmware V12.01.01.48

F3 v3.0 Firmware V12.01.01.52 

F3 v3.0 Firmware V12.01.01.55

F3 v4.0 Firmware V03.03.01.40

Overview

Multiple vulnerabilities have been reported in Tenda wireless routers, which could allow an attacker to obtain sensitive information and gain unauthorized access to the targeted device.

Target Audience:

End-users/ Administrators of Tenda wireless router

Risk Assessment:

Risk of exposure of credentials and router configuration settings.

Impact Assessment:

Impact on confidentiality and integrity of the vulnerable device.

Description

The Tenda 300Mbps Wireless Router F3 and the Tenda N300 Easy Setup Router are basic home/office Wi-Fi routers that support the 802.11n (Wi-Fi 4) standard and operate at wireless speeds of up to 300 Mbps on the 2.4 GHz band.

1. Cleartext Transmission Vulnerability ( CVE-2026-22079   )

This vulnerability exists in Tenda wireless routers due to the plaintext transmission of login credentials during the initial login or post-factory reset setup through the web-based administrative interface. An attacker on the same network could exploit this vulnerability by intercepting network traffic and capturing the credentials transmitted in plaintext.

Successful exploitation of this vulnerability could allow the attacker to obtain sensitive information and gain unauthorized access to the targeted device.

2. Insecure Transmission Vulnerability ( CVE-2026-22080   )

This vulnerability exists in Tenda wireless routers due to the transmission of credentials encoded using reversible Base64 encoding through the web-based administrative interface. An attacker on the same network could exploit this vulnerability by intercepting network traffic and capturing the Base64-encoded credentials.

Successful exploitation of this vulnerability could allow the attacker to obtain sensitive information and gain unauthorized access to the targeted device.

3. Cookie without HTTPOnly Flag Vulnerability ( CVE-2026-22081   )

This vulnerability exists in Tenda wireless routers due to the missing HTTPOnly flag for session cookies associated with the web-based administrative interface. A remote attacker could exploit this vulnerability by capturing session cookies transmitted over an insecure HTTP connection.

Successful exploitation of this vulnerability could allow the attacker to obtain sensitive information and gain unauthorized access to the targeted device.

4. Insecure Session ID Management Vulnerability ( CVE-2026-22082   )

This vulnerability exists in Tenda wireless routers due to the use of login credentials as the session ID through its web-based administrative interface. A remote attacker could exploit this vulnerability by intercepting network traffic and capturing the session ID during insecure transmission. 

Successful exploitation of this vulnerability could allow the attacker to hijack an authenticated session and compromise sensitive configuration information on the targeted device.

Credit

These vulnerabilities are reported by Deven Lunkad, Swaroop Dora, Naziya Aslam, and S. Venkatesan from IoT Security Research Lab, Indian Institute of Information Technology, Allahabad, India.

Solution

Apply appropriate updates as mentioned by the vendor:

https://www.tendacn.com/in/material/show/724624313163845

Vendor Information

Tenda India

https://www.tendacn.com/in/material/show/724624313163845

References

Tenda India

https://www.tendacn.com/in/material/show/724624313163845

CVE Name

CVE-2026-22079

CVE-2026-22080

CVE-2026-22081

CVE-2026-22082

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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